Webster Valve CO Dam

CHANCE POND BROOK· Merrimack, New Hampshire· Built 1901· Concrete· 15 ft tall

Significant Hazard Other Private

Key Takeaway

Webster Valve CO Dam is classified as significant hazard in New Hampshire. It was completed in 1901 and is 125 years old. Its primary use is other. Significant hazard means failure could cause economic or environmental damage. Learn more.

Physical Details

Dam Height	15 ft (taller than 47.8% in NH)
Dam Length	178 ft
Dam Type	Concrete
Max Storage	1 acre-ft
Normal Storage	1 acre-ft

Surface Area	0 acres
Drainage Area	19 sq mi
Max Discharge	659 cfs
Year Completed	1901 (125 years old)
NID ID	NH03736

Safety Information

Significant Hazard

No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.

Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?

Emergency Action Plan: No

Last Inspection: June 9, 2021

State Regulated: Yes

Regulatory Agency: NH DES

Ownership

174 N MAIN ST FRANLIN LLC

Private

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Frequently Asked Questions

What is the hazard classification of Webster Valve CO Dam?

Webster Valve CO Dam is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates Webster Valve CO Dam?

Webster Valve CO Dam is owned by 174 N MAIN ST FRANLIN LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Webster Valve CO Dam built?

Webster Valve CO Dam was completed in 1901, making it 125 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.

What is the primary purpose of Webster Valve CO Dam?

Webster Valve CO Dam serves the following purposes: Other. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Webster Valve CO Dam?

Webster Valve CO Dam has a dam height of 15 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.

When was Webster Valve CO Dam last inspected?

Webster Valve CO Dam was last inspected on June 9, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.

Data from the National Inventory of Dams (NID) maintained by the US Army Corps of Engineers. Dam conditions may have changed since the last update. This site is not affiliated with USACE. Do not use for emergency planning — contact your local dam safety program.